public async override Task OnDisconnectedAsync(Exception exception)
{
var username = MainHubData.GetUsers().ContainsKey(Context.ConnectionId) ?
MainHubData.GetUsers()[Context.ConnectionId].Username : null;
if (username != null)
{
await Clients.All
.ShowMessage(ChatMessage.CreateAsJSON(MainHubData.ServerUser, username + " left the chat!",
ChatMessage.MessageType.Welcome));
}
MainHubData.RemoveUser(Context.ConnectionId);
await base.OnDisconnectedAsync(exception);
}
public async Task SendMessageFromClient(string user, string message)
{
var correct_user = MainHubData.GetUsers()[Context.ConnectionId];
if (user != correct_user.Username)
{
throw new InvalidOperationException("Client is using an invalid username.");
}
if (!MainHubData.RegisterMessage(new ChatMessage(correct_user, message)))
{
await Clients.Client(Context.ConnectionId)
.ShowMessage(ChatMessage.CreateAsJSON(MainHubData.ServerUser, "You are kicked.", ChatMessage.MessageType.Error));
Context.Abort();
}
}
public async Task RegisterUser(string username, string ipAddress)
{
ChatUser new_user = new ChatUser(Context.ConnectionId, username, ipAddress);
var username_registered = MainHubData.RegisterUser(new_user);
await Clients.Client(Context.ConnectionId)
.ConfirmUsername(username, username_registered);
if (username_registered)
{
await Clients.Client(Context.ConnectionId)
.ShowMessage(ChatMessage.CreateAsJSON(MainHubData.ServerUser, "Welcome " + username + "!",
ChatMessage.MessageType.Welcome));
await Clients.AllExcept(new List <string> {
Context.ConnectionId
})
.ShowMessage(ChatMessage.CreateAsJSON(MainHubData.ServerUser, username + " joined the chat!",
ChatMessage.MessageType.Welcome));
}
}
public async Task GetNumberOfActiveUsers()
{
await Clients.Client(Context.ConnectionId)
.SendNumberOfActiveUsers(JsonSerializer.Serialize(new { count_users = MainHubData.GetUsers().Count }));
}